Ⅰ、1、I'm reading a book that / which
is about famous musicians.
2、Does Tony like the Lions who
can write interesting lyrics?
3、Britney who is one of my favorite
singers has changed a lot.
4、I will buy something that my
grandpa likes best next Sunday.

Ⅱ、1、B 2、A 3、C

Ⅲ、1、Because they are, possibly, the only two months with no school holidays.
2、Not everybody wants to have many holidays.
3、In the training centers.
4、Two. They are the school trip to the training centers and the school trip to other
countries.